自己基于OPENCV 2.1写的HALCON标定板圆心提取算法，测试过，鲁棒性不错，有OPENCV标定重投影误差小于0.1个像素。-Own the center extraction algorithm based on OpenCV 2.1 write HALCON calibration plate, tested, good robustness, the OPENCV calibration reprojection error is less than 0.1 pixels.